Each is definable only in terms of the other, and they go together transactionally, like buying and selling, for there is no sale without a purchase, and no purchase without a sale. As this awareness becomes increasingly intense, you feel that you yourself are polarized with the external universe in such a way that you imply each other. Your push is its pull, and its push is your pull—as when you move the steering wheel of a car. Are you pushing it or pulling it?